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What is the specific function of a satellite in a chromosome ? How are sat-chromosomes different from others ? On molecular basis, what are the functional advantages of it ?

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There are at least 2 SAT chromosomes in each diploid nucleus. They play a vital role in the formation of the nucleolus after cell division is completed.

In humans, chromosomes number 13, 14, 15, 21 and 22 are examples of SAT chromosomes.

cuted from http://en.wikipedia.org/wiki/Satellite_chromosome

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